/* ===== CSS 变量和主题 ===== */
:root {
    /* 颜色变量 */
    --color-primary: #3b82f6;
    --color-primary-dark: #2563eb;
    --color-primary-light: #60a5fa;
    --color-secondary: #6b7280;
    --color-success: #10b981;
    --color-warning: #f59e0b;
    --color-danger: #ef4444;
    --color-info: #06b6d4;
    
    /* 背景色 */
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-tertiary: #334155;
    --bg-card: #1e293b;
    
    /* 文字颜色 */
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    
    /* 边框 */
    --border-color: #334155;
    --border-radius: 8px;
    --border-radius-lg: 12px;
    
    /* 间距 */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    
    /* 阴影 */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.3);
    
    /* 动画 */
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
    --transition-slow: 350ms ease;
    
    /* 尺寸 */
    --header-height: 60px;
    --sidebar-width: 360px;
    --status-bar-height: 40px;
}

/* ===== 基础样式重置 ===== */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.5;
    overflow: hidden;
    min-height: 100vh;
}

/* ===== 应用容器 ===== */
#app {
    display: flex;
    flex-direction: column;
    height: 100vh;
    overflow: hidden;
}

/* ===== 头部 ===== */
.header {
    height: var(--header-height);
    background-color: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    flex-shrink: 0;
    z-index: 100;
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
    padding: 0 var(--spacing-lg);
    max-width: 100%;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
}

.logo-icon {
    width: 28px;
    height: 28px;
    color: var(--color-primary);
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

/* ===== 按钮样式 ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: 0.875rem;
    font-weight: 500;
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: all var(--transition-fast);
    text-decoration: none;
    white-space: nowrap;
}

.btn svg {
    width: 16px;
    height: 16px;
}

.btn-primary {
    background-color: var(--color-primary);
    color: white;
}

.btn-primary:hover {
    background-color: var(--color-primary-dark);
}

.btn-secondary {
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
}

.btn-secondary:hover {
    background-color: var(--border-color);
}

.btn-danger {
    background-color: var(--color-danger);
    color: white;
}

.btn-danger:hover {
    background-color: #dc2626;
}

.btn-sm {
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: 0.75rem;
}

.btn-sm svg {
    width: 14px;
    height: 14px;
}

.btn-lg {
    padding: var(--spacing-md) var(--spacing-lg);
    font-size: 1rem;
}

.btn-lg svg {
    width: 20px;
    height: 20px;
}

.btn-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    padding: 0;
    background: transparent;
    border: none;
    border-radius: var(--border-radius);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.btn-icon:hover {
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
}

.btn-icon svg {
    width: 20px;
    height: 20px;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* ===== 主内容区 ===== */
.main-content {
    display: flex;
    flex: 1;
    overflow: hidden;
}

/* ===== 侧边栏 ===== */
.sidebar {
    width: var(--sidebar-width);
    background-color: var(--bg-secondary);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
    overflow: hidden;
    transition: width var(--transition-normal), transform var(--transition-normal);
}

.sidebar.collapsed {
    width: 0;
    border-right: none;
}

.sidebar-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-md) var(--spacing-lg);
    border-bottom: 1px solid var(--border-color);
}

.sidebar-header h2 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
}

/* ===== 连接表单 ===== */
.connection-form {
    padding: var(--spacing-lg);
    overflow-y: auto;
    flex: 1;
}

.form-group {
    margin-bottom: var(--spacing-md);
}

.form-group label {
    display: block;
    margin-bottom: var(--spacing-xs);
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.form-group input[type="text"],
.form-group input[type="number"],
.form-group input[type="password"],
.form-group select,
.form-group textarea {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: 0.875rem;
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    color: var(--text-primary);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.2);
}

.form-group textarea {
    resize: vertical;
    min-height: 100px;
    font-family: 'Fira Code', 'Consolas', monospace;
    font-size: 0.75rem;
}

.form-group select {
    cursor: pointer;
}

.password-input-wrapper {
    position: relative;
    display: flex;
    align-items: center;
}

.password-input-wrapper input {
    padding-right: 40px;
}

.password-input-wrapper .btn-icon {
    position: absolute;
    right: 4px;
    width: 32px;
    height: 32px;
}

.password-input-wrapper .btn-icon svg {
    width: 16px;
    height: 16px;
}

.checkbox-group {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.checkbox-group input[type="checkbox"] {
    width: 16px;
    height: 16px;
    cursor: pointer;
    accent-color: var(--color-primary);
}

.checkbox-group label {
    margin-bottom: 0;
    cursor: pointer;
}

/* ===== 认证区域 ===== */
.auth-section {
    animation: fadeIn var(--transition-normal);
}

.auth-section.hidden {
    display: none;
}

/* ===== 文件上传 ===== */
.file-upload {
    margin-top: var(--spacing-sm);
}

.file-upload input[type="file"] {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* ===== 高级选项 ===== */
.advanced-options {
    margin-top: var(--spacing-md);
    padding: var(--spacing-md);
    background-color: var(--bg-tertiary);
    border-radius: var(--border-radius);
}

.advanced-options summary {
    cursor: pointer;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
    user-select: none;
}

.advanced-options summary:hover {
    color: var(--text-primary);
}

.advanced-options[open] summary {
    margin-bottom: var(--spacing-md);
}

/* ===== 表单操作按钮 ===== */
.form-actions {
    display: flex;
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

.form-actions .btn {
    flex: 1;
}

/* ===== 保存的连接 ===== */
.saved-connections {
    padding: var(--spacing-md) var(--spacing-lg);
    border-top: 1px solid var(--border-color);
}

.saved-connections h3 {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
}

.connection-list {
    list-style: none;
}

.connection-list li {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-sm) var(--spacing-md);
    margin-bottom: var(--spacing-xs);
    background-color: var(--bg-tertiary);
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: background-color var(--transition-fast);
}

.connection-list li:hover {
    background-color: var(--border-color);
}

.connection-list .connection-name {
    font-size: 0.875rem;
    font-weight: 500;
}

.connection-list .connection-host {
    font-size: 0.75rem;
    color: var(--text-muted);
}

.connection-list .btn-delete {
    opacity: 0;
    transition: opacity var(--transition-fast);
}

.connection-list li:hover .btn-delete {
    opacity: 1;
}

/* ===== 终端容器 ===== */
.terminal-container {
    flex: 1;
    display: flex;
    flex-direction: column;
    background-color: var(--bg-primary);
    overflow: hidden;
    position: relative;
}

/* ===== 终端状态栏 ===== */
.terminal-status-bar {
    height: var(--status-bar-height);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 var(--spacing-md);
    background-color: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    flex-shrink: 0;
}

.status-info {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.status-indicator {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: 0.875rem;
}

.status-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background-color: var(--text-muted);
}

.status-indicator.connected .status-dot {
    background-color: var(--color-success);
    box-shadow: 0 0 8px var(--color-success);
}

.status-indicator.connecting .status-dot {
    background-color: var(--color-warning);
    animation: pulse 1s infinite;
}

.status-indicator.error .status-dot {
    background-color: var(--color-danger);
}

.connection-info {
    font-size: 0.75rem;
    color: var(--text-muted);
}

.terminal-actions {
    display: flex;
    gap: var(--spacing-xs);
}

/* ===== 终端 ===== */
.terminal {
    flex: 1;
    padding: var(--spacing-sm);
    overflow: hidden;
}

.terminal.hidden {
    display: none;
}

/* xterm.js 样式覆盖 */
.xterm {
    height: 100%;
}

.xterm-viewport {
    overflow-y: auto !important;
}

.xterm-viewport::-webkit-scrollbar {
    width: 10px;
}

.xterm-viewport::-webkit-scrollbar-track {
    background: var(--bg-secondary);
}

.xterm-viewport::-webkit-scrollbar-thumb {
    background: var(--bg-tertiary);
    border-radius: 5px;
}

.xterm-viewport::-webkit-scrollbar-thumb:hover {
    background: var(--border-color);
}

/* ===== 欢迎界面 ===== */
.welcome-screen {
    position: absolute;
    top: var(--status-bar-height);
    left: 0;
    right: 0;
    bottom: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--bg-primary);
    z-index: 10;
}

.welcome-screen.hidden {
    display: none;
}

.welcome-content {
    text-align: center;
    max-width: 500px;
    padding: var(--spacing-xl);
}

.welcome-icon {
    width: 80px;
    height: 80px;
    color: var(--color-primary);
    margin-bottom: var(--spacing-lg);
}

.welcome-content h2 {
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
}

.welcome-content p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xl);
}

.features {
    display: flex;
    justify-content: center;
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.feature {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.feature svg {
    width: 32px;
    height: 32px;
    color: var(--color-primary-light);
}

/* ===== 通知 ===== */
.notifications {
    position: fixed;
    top: calc(var(--header-height) + var(--spacing-md));
    right: var(--spacing-md);
    z-index: 1000;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.notification {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md) var(--spacing-lg);
    background-color: var(--bg-card);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-lg);
    animation: slideIn var(--transition-normal);
    max-width: 400px;
}

.notification.success {
    border-left: 4px solid var(--color-success);
}

.notification.error {
    border-left: 4px solid var(--color-danger);
}

.notification.warning {
    border-left: 4px solid var(--color-warning);
}

.notification.info {
    border-left: 4px solid var(--color-info);
}

.notification-icon {
    width: 24px;
    height: 24px;
    flex-shrink: 0;
}

.notification.success .notification-icon {
    color: var(--color-success);
}

.notification.error .notification-icon {
    color: var(--color-danger);
}

.notification.warning .notification-icon {
    color: var(--color-warning);
}

.notification.info .notification-icon {
    color: var(--color-info);
}

.notification-content {
    flex: 1;
}

.notification-title {
    font-weight: 600;
    margin-bottom: 2px;
}

.notification-message {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.notification .btn-close {
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    font-size: 1.25rem;
    padding: 0;
    line-height: 1;
}

.notification .btn-close:hover {
    color: var(--text-primary);
}

/* ===== 模态框 ===== */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal.hidden {
    display: none;
}

.modal-backdrop {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
}

.modal-content {
    position: relative;
    width: 100%;
    max-width: 500px;
    max-height: 90vh;
    background-color: var(--bg-card);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-lg);
    overflow: hidden;
    animation: fadeIn var(--transition-normal);
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--border-color);
}

.modal-header h2 {
    font-size: 1.25rem;
    font-weight: 600;
}

.modal-header .btn-close {
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--text-muted);
    cursor: pointer;
    padding: 0;
    line-height: 1;
}

.modal-header .btn-close:hover {
    color: var(--text-primary);
}

.modal-body {
    padding: var(--spacing-lg);
    overflow-y: auto;
    max-height: calc(90vh - 140px);
}

.modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: var(--spacing-md);
    padding: var(--spacing-lg);
    border-top: 1px solid var(--border-color);
}

.settings-section {
    margin-bottom: var(--spacing-lg);
}

.settings-section:last-child {
    margin-bottom: 0;
}

.settings-section h3 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    color: var(--text-secondary);
}

/* ===== 动画 ===== */
@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateX(100%);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.5;
    }
}

/* ===== 隐藏类 ===== */
.hidden {
    display: none !important;
}

/* ===== 响应式设计 ===== */
@media (max-width: 768px) {
    :root {
        --sidebar-width: 100%;
    }
    
    .main-content {
        flex-direction: column;
    }
    
    .sidebar {
        position: absolute;
        top: var(--header-height);
        left: 0;
        right: 0;
        bottom: 0;
        z-index: 50;
        transform: translateX(-100%);
        transition: transform var(--transition-normal);
    }
    
    .sidebar.open {
        transform: translateX(0);
    }
    
    .features {
        flex-direction: column;
        gap: var(--spacing-md);
    }
    
    .notification {
        max-width: calc(100vw - var(--spacing-lg) * 2);
    }
}

@media (max-width: 480px) {
    .header-content {
        padding: 0 var(--spacing-md);
    }
    
    .logo span {
        display: none;
    }
    
    .btn span {
        display: none;
    }
    
    .btn svg {
        margin: 0;
    }
}